Resin composition and molded article comprising the same

Abstract

The present invention relates to a polyalkylene carbonate / graft copolymer resin composition having improved elongation properties and surface properties, and a molded article comprising the same; the present invention relates to a polyalkylene carbonate resin, and provides a resin composition comprising a polyalkylene carbonate resin having a capping portion and a graft copolymer, and a molded article comprising the same, the end cap is a unit derived from any one or more selected from the group consisting of maleic anhydride, 4-tert-octylphenol, 2-naphthol, 4-n-butoxyphenol, 4-phenylphenol, 4-(benzyloxy) phenol, and 4-tert-butylphenol.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Korean Patent Application No. 10-2023-0008271 filed on January 19, 2023, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] The present invention relates to a polyalkylene carbonate / graft copolymer resin composition having improved elongation properties and surface properties and a molded article comprising the resin composition. Background Art

[0004] Polyalkylene carbonate (PAC) is a resin that uses carbon dioxide, the main culprit of greenhouse gases, as a raw material through carbon capture and utilization (CCU). It provides excellent flexibility, transparency, barrier properties and clean combustion advantages, and is therefore used in daily necessities.

[0005] However, polyalkylene carbonate has poor heat resistance, strength, and molding processability, and therefore is difficult to use alone, but is blended with other resins such as ABS and then used by extrusion molding.

[0006] Meanwhile, ABS has poor weather resistance due to the double bond of butadiene and thus has a high risk of yellowing when used for a long time, making it difficult to incorporate into a composition in a large amount.

[0007] Furthermore, polyalkylene carbonate has poor compatibility with ABS, resulting in phase separation, and thus it is difficult to maintain the physical properties at the desired level.

[0008] Therefore, there is a need to develop a resin composition having improved compatibility when blending polyalkylene carbonate with ABS, thereby having improved yellowing characteristics and surface texture while maintaining the excellent physical properties of ABS.

[0009] [Related technical literature]

[0010] [Patent Document]

[0011] (Patent Document 1) KR10-2013-0000031A (January 2, 2013) Summary of the Invention

[0012] Technical issues

[0013] The present invention aims to overcome the limitations of the prior art. Therefore, one aspect of the present invention provides a resin composition that maintains the excellent physical properties (tensile strength, etc.) of the graft copolymer while having improved molding processing performance caused by excellent compatibility, as well as improved elongation and surface properties.

[0014] Another aspect of the present invention provides a molded article produced using and thus comprising the resin composition.

[0015] Technical Solution

[0016] In order to achieve the above-mentioned objects, the present invention provides a resin composition and a molded article.

[0017] (1) According to one aspect of the present invention, a resin composition is provided, which comprises a polyalkylene carbonate resin having an end-capping end and a graft copolymer, wherein the end-capping end is derived from any one or more units selected from maleic anhydride, 4-tert-octylphenol, 2-naphthol, 4-n-butoxyphenol, 4-phenylphenol, 4-(benzyloxy)phenol and 4-tert-butylphenol.

[0018] (2) The present invention provides the resin composition according to (1) above, wherein the end-capping unit is a maleic anhydride-derived unit.

[0019] (3) The present invention provides the resin composition according to (1) or (2) above, wherein the polyalkylene carbonate resin contains 0.5% by weight to 2.0% by weight of the end-capping portion.

[0020] (4) The present invention provides the resin composition according to any one of (1) to (3) above, wherein the polyalkylene carbonate resin and the graft copolymer are present in a weight ratio of 1:0.5 to 9.

[0021] (5) The present invention provides a resin composition according to any one of (1) to (4) above, wherein the graft copolymer comprises a conjugated diene rubber core and a shell comprising units derived from an aromatic vinyl monomer and units derived from a vinyl cyanide monomer.

[0022] (6) The present invention provides a resin composition according to the above (5), wherein the graft copolymer comprises 30% to 70% by weight of a conjugated diene rubber core and 30% to 70% by weight of a shell comprising aromatic vinyl monomer-derived units and vinyl cyanide monomer-derived units, and the shell comprises 55% to 85% by weight of aromatic vinyl monomer-derived units and 15% to 45% by weight of vinyl cyanide monomer-derived units.

[0023] (7) The present invention provides the resin composition according to any one of (1) to (6) above, wherein the polyalkylene carbonate resin further contains an antioxidant-derived unit.

[0024] (8) The present invention provides a resin composition according to any one of (1) to (7) above, wherein the polyalkylene carbonate resin has a heat resistance temperature of 230°C to 300°C and a melt index measured at 190°C with a load of 2.16 kg of 1 g / 10 min to 25 g / 10 min.

[0025] (9) The present invention provides the resin composition according to any one of (1) to (8) above, further comprising a compatibilizer.

[0026] (10) According to another aspect of the present invention, there is provided a molded article comprising the resin composition according to any one of (1) to (9) above.

[0027] Beneficial effects

[0028] The resin composition according to the present invention comprises a polyalkylene carbonate having end caps and a graft copolymer, and thus has improved molding processability due to excellent compatibility, and has improved elongation and surface properties while maintaining excellent mechanical properties such as tensile properties of the graft copolymer.

[0029] Furthermore, the molded article according to the present invention is produced from the above-mentioned resin composition and thus includes the resin composition, thereby having excellent mechanical properties, as well as excellent elongation and surface properties. DETAILED DESCRIPTION

[0030] Hereinafter, the present invention will be described in detail to help understanding of the present invention.

[0031] It should be understood that the words or terms used in the description and claims of the present invention should not be construed as limited to having the meanings defined in commonly used dictionaries. It will be further understood that, based on the inventors' ability to appropriately define the meanings of words or terms to best illustrate the principles of the present invention, words or terms should be construed as having meanings consistent with their meanings in the context of the relevant art and the technical concept of the present invention.

[0032] Definition of terms

[0033] In this specification, the term "derived unit" may refer to a component or structure derived from a certain compound, or the compound itself.

[0034] As used herein, the term "composition" encompasses reaction products and decomposition products formed from the materials of the composition, as well as mixtures comprising the materials of the composition.

[0035] Resin composition

[0036] The present invention provides a resin composition having excellent elongation and surface properties.

[0037] The resin composition according to one embodiment of the present invention comprises a polyalkylene carbonate resin having end-capping ends and a graft copolymer, and the end-capping ends are units derived from any one or more selected from maleic anhydride, 4-tert-octylphenol, 2-naphthol, 4-n-butoxyphenol, 4-phenylphenol, 4-(benzyloxy)phenol and 4-tert-butylphenol.

[0038] Polyalkylene carbonate (PAC) is a resin that uses carbon dioxide, the main culprit of greenhouse gases, as a raw material. It provides excellent flexibility, transparency, barrier properties and clean burning advantages, and is therefore used in daily necessities. However, polyalkylene carbonate has poor heat resistance, strength and molding processability, so it is difficult to use alone. Instead, it is blended with other resins such as ABS and used by extrusion molding. However, due to the double bond of butadiene, ABS has poor weather resistance and therefore has a high risk of yellowing when used for a long time, making it difficult to add a large amount to the composition. In addition, polyalkylene carbonate has poor compatibility with ABS, resulting in phase separation, so it is difficult to maintain physical properties at the desired level.

[0039] However, the resin composition according to the present invention includes polyalkylene carbonate, the terminals of which are modified with a capping agent, and thus has excellent compatibility with ABS, as well as improved elongation and surface properties.

[0040] Hereinafter, the resin composition of the present invention is divided into subcomponents and described in more detail.

[0041] Polyalkylene carbonate resin

[0042] The polyalkylene carbonate resin according to the present invention is a resin whose terminal is modified by a terminal blocking agent, specifically, a resin having a structure in which the terminal of polyalkylene carbonate is modified by a terminal blocking agent and a terminal blocking unit as a unit derived from the terminal blocking agent is bonded.

[0043] Generally, polyalkylene carbonates have a problem of low thermal stability due to the presence of carboxyl groups of carbonate groups at the ends, which leads to thermal decomposition at relatively low temperatures. However, the polyalkylene carbonate resin according to the present invention is a resin in which the ends of the polyalkylene carbonate are modified by an end-capping agent, that is, the carboxyl groups in the polyalkylene carbonate are esterified by the end-capping agent to form ester groups at the ends, and thus can exhibit an elevated thermal decomposition temperature of 50°C or higher, specifically 60°C or higher, compared to conventional polyalkylene carbonates.

[0044] In this case, the end-capping group may be a unit derived from any one or more selected from maleic anhydride, 4-tert-octylphenol, 2-naphthol, 4-n-butoxyphenol, 4-phenylphenol, 4-(benzyloxy)phenol and 4-tert-butylphenol, specifically, the end-capping group may be a maleic anhydride-derived unit.

[0045] In addition, the polyalkylene carbonate may contain 0.5 wt % to 2.0 wt %, specifically 0.5 wt % to 1.0 wt % of a terminal block, in which case the terminal block functions as an acid catalyst to promote hydrolysis of the resin, and thus, due to the terminal block, the above-mentioned improvement in thermal stability can be sufficiently provided without deteriorating the thermal stability.

[0046] In addition, the polyalkylene carbonate resin may have a heat resistance temperature of 230°C to 300°C, specifically 250°C to 280°C.

[0047] In addition, the polyalkylene carbonate resin may have a melt flow index measured at 190° C. with a load of 2.16 kg of 1 to 25 g / 10 min, specifically 1 to 15 g / 10 min, 1 to 10 g / 10 min, or 3 to 8 g / 10 min.

[0048] In addition, the polyalkylene carbonate resin according to one embodiment of the present invention may further contain an antioxidant-derived unit when necessary. In this case, the antioxidant is not particularly limited as long as it is well known in the art, but may be, for example, any one or more selected from phenolic antioxidants, aromatic amine antioxidants, phosphorus antioxidants, and sulfur antioxidants.

[0049] Meanwhile, the polyalkylene carbonate resin containing end-capping according to one embodiment of the present invention can be manufactured by subjecting a polyalkylene carbonate to an extrusion reaction with an end-capping agent and, if necessary, an antioxidant at a temperature of 170° C. to 190° C. in the presence of a reaction initiator, and the extrusion reaction can be carried out using a known mixing processing apparatus such as a twin-screw extruder, a single-screw extruder, a roll mill, a kneader, or a Banbury mixer.

[0050] In this case, the polyalkylene carbonate used in the extrusion reaction is a polyalkylene carbonate having -COO-(CH2) n -CH2CH2O- (n is an integer from 2 to 12) repeating units, and may be, for example, one or more selected from polyethylene carbonate, polypropylene carbonate, polypentylene carbonate, polyhexylene carbonate, polyoctylene carbonate and polycyclohexylene carbonate, and may specifically be polyethylene carbonate or polypropylene carbonate.

[0051] The polyalkylene carbonate resin may have a weight average molecular weight of about 10,000 g / mol to about 1,000,000 g / mol, for example about 50,000 g / mol to about 500,000 g / mol or about 100,000 g / mol to about 200,000 g / mol.

[0052] In addition, the polyalkylene carbonate resin can be a copolymer or terpolymer prepared by copolymerizing an epoxy compound and carbon dioxide as monomers in an organic solvent in the presence of an organic metal catalyst. In this case, the epoxy compound can be, for example, one or more selected from ethylene oxide, propylene oxide, 1,2-butylene oxide, 2,3-butylene oxide, methylpropylene oxide, 1,2-pentene oxide, 2,3-pentene oxide, 1,2-hexene oxide, 1,2-octane oxide, 1,2-cyclopentane oxide, cyclohexene oxide, styrene oxide and butylene oxide. The carbon dioxide can be adjusted to 5 to 30 atmospheres and the copolymerization can be carried out at 20° C. to 120° C.

[0053] Graft copolymer

[0054] In the present invention, the graft copolymer may be an ABS resin, and the graft copolymer may specifically include a conjugated diene rubber core and a shell containing units derived from an aromatic vinyl monomer and units derived from a vinyl cyanide monomer. Specifically, the conjugated diene rubber core comprises 30 to 70% by weight, and the shell comprises 30 to 70% by weight of units derived from an aromatic vinyl monomer and units derived from a vinyl cyanide monomer. The shell may also contain 55 to 85% by weight of units derived from an aromatic vinyl monomer and 15 to 45% by weight of units derived from a vinyl cyanide monomer. In this case, the impact resistance may be improved.

[0055] Meanwhile, the graft copolymer can be prepared by graft-polymerizing an aromatic vinyl monomer and a vinyl cyanide monomer onto a conjugated diene rubber polymer. In this case, the conjugated diene rubber polymer can be a homopolymer of the conjugated diene monomer, a copolymer of the conjugated diene monomer and an aromatic vinyl monomer, or a copolymer of the conjugated diene monomer and a vinyl cyanide monomer. The conjugated diene rubber polymer can be prepared by emulsion polymerization of the monomer in the presence of a polymerization initiator and an emulsifier, and the graft polymer can be prepared by emulsion polymerization of the conjugated diene rubber polymer, an aromatic vinyl monomer, and a vinyl cyanide monomer in the presence of a polymerization initiator and an emulsifier.

[0056] The conjugated diene monomer may be, for example, one or more selected from 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene and 2-phenyl-1,3-butadiene, and specifically may be 1,3-butadiene.

[0057] The aromatic vinyl monomer may be, for example, one or more selected from the group consisting of styrene, α-methylstyrene, p-methylstyrene, o-ethylstyrene, p-ethylstyrene, and vinyltoluene, and specifically, may be styrene.

[0058] In addition, the vinyl cyan-based monomer may be one or more selected from acrylonitrile, methacrylonitrile, and ethacrylonitrile, and specifically, may be acrylonitrile.

[0059] The emulsifier added in each of the above emulsion polymerization processes can be selected from alkali metal salts of fatty acids, alkali metal salts of rosin acid, alkali metal salts of oleic acid and combinations of two or more thereof, and the polymerization initiator can be selected from sodium persulfate, potassium persulfate, cumene hydroperoxide, diisopropylbenzene hydroperoxide and combinations of two or more thereof.

[0060] Furthermore, when emulsion polymerization is carried out, a molecular weight regulator may be further added as needed.

[0061] Resin composition

[0062] In the present invention, the resin composition may include the polyalkylene carbonate resin and the graft copolymer in a weight ratio of 1:0.5 to 9, specifically 1:1 to 9 or 1:2 to 5, in which case the elongation and the tensile strength may be well balanced.

[0063] In addition, as the ratio of the polyalkylene carbonate resin increases, the elongation property increases, but the tensile strength may be deteriorated, and the resin composition according to one embodiment of the present invention may include the polyalkylene carbonate resin and the graft copolymer in a ratio adjusted within the above range according to the intended use.

[0064] Meanwhile, the resin composition according to one embodiment of the present invention may further include a compatibilizer when necessary, and the compatibilizer may be used without particular limitation as long as it is a material well known in the art, and may be, for example, selected from any one or more of maleic anhydride, hexamethylene diisocyanate, methylene diphenyl diisocyanate, methyl methacrylate, and styrene copolymers.

[0065] In addition, when necessary, the resin composition may further contain any one or more additives selected from antioxidants, ultraviolet absorbers, flame retardants, internal mold release agents, lubricants, light stabilizers, release agents, plasticizers, antibacterial agents, organic fillers, inorganic fillers, pigments and crosslinking agents.

[0066] Molded products

[0067] The present invention provides a molded article produced using the resin composition and thus comprising the resin composition.

[0068] The molded article according to one embodiment of the present invention can be produced by processing (such as injection) the resin composition and can be, for example, one or more selected from films, packaging materials, oriented films, injection-molded products, blow-molded products, laminated products, tapes, nonwoven fabrics and threads.

[0069] The molded article according to one embodiment of the present invention includes the above-mentioned resin composition and thus may have excellent impact resistance, elongation, and surface properties.

[0070] Hereinafter, embodiments of the present invention will be described in detail in a manner that can be easily performed by those skilled in the art. However, the present invention can be implemented in many different forms and is not limited to the embodiments set forth herein.

[0071] Example

[0072] Information on materials used in Preparation Examples, Examples, and Comparative Examples is as follows.

[0073] Polyethylene carbonate resin: weight average molecular weight 146,889 g / mol, 25(EMPOWER MATERIALS)

[0074] Graft copolymer: 60% by weight butadiene, 75:25 weight ratio of styrene and acrylonitrile, HF380 (LGCHEM)

[0075] Preparation Example 1

[0076] 100 parts by weight of polyethylene carbonate resin, 1 part by weight of maleic anhydride and 0.1 parts by weight of dicumyl peroxide were placed in a twin-screw extruder and subjected to extrusion reaction at an extrusion temperature of 170° C. to prepare a polyethylene carbonate resin containing end caps.

[0077] Preparation Example 2

[0078] A polyethylene carbonate resin including a terminal block was prepared in the same manner as in Preparation Example 1, except that 4-tert-butylphenol was used instead of maleic anhydride, unlike Example 1.

[0079] Preparation Example 3

[0080] A polyethylene carbonate resin including a terminal block was prepared in the same manner as in Preparation Example 1, except that 4-tert-butoxyphenol was used instead of maleic anhydride, unlike Example 1.

[0081] Example 1

[0082] The polyethylene carbonate resin containing end capping prepared in Preparation Example 1 was mixed with the graft copolymer at a weight ratio of 1:4 to prepare a resin composition.

[0083] The resin composition was extruded at 200° C. using an extruder to obtain a pellet-shaped molded article.

[0084] Example 2

[0085] A resin composition and a molded article were prepared in the same manner as in Example 1, except that, unlike Example 1, the end-capped polyethylene carbonate resin and the graft copolymer were mixed at a weight ratio of 1:1.5.

[0086] Example 3

[0087] A resin composition and a molded article were prepared in the same manner as in Example 1, except that, unlike Example 1, the end-capped polyethylene carbonate resin and the graft copolymer were mixed at a weight ratio of 1:0.67.

[0088] Example 4

[0089] A resin composition and a molded article were prepared in the same manner as in Example 1, except that the end-capped polyethylene carbonate resin prepared in Preparation Example 2 was used, which was different from that in Example 1.

[0090] Example 5

[0091] A resin composition and a molded article were prepared in the same manner as in Example 1, except that the end-capped polyethylene carbonate resin prepared in Preparation Example 3 was used, which was different from that in Example 1.

[0092] Comparative Example 1

[0093] The graft copolymer was extruded at 200° C. using an extruder to obtain a pellet-shaped molded article.

[0094] Comparative Example 2

[0095] In addition to the difference from Example 1, polyethylene carbonate ( A resin composition and a molded article were prepared in the same manner as in Example 1, except that the end-capped polyethylene carbonate resin prepared in Preparation Example 1 was replaced with 25, EMPOWER MATERIALS.

[0096] Experimental Example 1

[0097] In order to determine whether the modified polyethylene carbonate containing end caps prepared in Preparation Examples 1 to 3 was modified, the polyalkylene carbonate used as a raw material (Comparative Preparation Example), thermal decomposition temperature and melt index were compared and analyzed, and the results are shown in Table 1 below.

[0098] (1) Thermal decomposition temperature (Td, °C)

[0099] The thermal decomposition temperature was measured using a thermogravimetric analyzer (TGA, Large Furnace (LF) Thermogravimetric Analyzer, Mettler-Toledo) at a weight loss rate of 1.0% while increasing the temperature from 30° C. to 400° C. at a rate of 10° C. / min.

[0100] (2) Melt index (MFI, g / 10min)

[0101] After preheating at 190° C. for 6 minutes under a load of 2.16 kg, the melt index was measured using a flow tester.

[0102] [Table 1]

[0103] project Preparation Example 1 Preparation Example 2 Preparation Example 3 Preparation Comparative Example Td(℃) 258.6 223.6 239.1 196.2 Melt index (g / 10min) 7.1 4.2 3.6 1.5

[0104] Table 1 shows that the thermal decomposition temperature and melt index of Preparation Examples 1 to 3 are increased compared with the polyethylene carbonate resin of Comparative Preparation Example, and therefore, it is determined that the terminal of the polyethylene carbonate resin containing the end cap of Preparation Examples 1 to 3 is modified.

[0105] Experimental Example 2

[0106] The melt index of the resin compositions prepared in Examples and Comparative Examples, and the tensile strength, elongation, and whiteness index of the specimens obtained from the resin compositions were measured, and the results are shown in Tables 2 and 3 below.

[0107] (1) Melt index

[0108] After preheating at 200° C. for 6 minutes under a load of 2.16 kg, each resin composition was measured using a flow tester.

[0109] Meanwhile, in Comparative Example 1, the melt index of the graft copolymer was measured.

[0110] (2) Tensile strength (MPa) and elongation (%)

[0111] According to ASTM D412, each molded article was made into three dumbbell-shaped specimens, and then the tensile strength was measured using a univer testing machine (UTM, Instron) at a speed of 50 mm / min. Each measurement was performed three times, and the average value was obtained as the result.

[0112] According to ASTM D638, each molded article was made into three dumbbell-shaped specimens, and then the elongation of each specimen when cut was measured under the same conditions as the tensile strength measurement. Each measurement was performed three times, and the average value was obtained as the result.

[0113] (3) Whiteness index

[0114] A temperature of 170° C. was applied to each molded article to prepare a film (thickness: 30 μm), and a specimen having a size of 100 mm×100 mm (width×height) was prepared. The whiteness index of each specimen was measured using an UltraScan PRO model according to CIE STM 1979.

[0115] [Equation 1]

[0116] Whiteness index (WI) = Ya(x-xn)-b(y-yn)

[0117] In Equation 1, Y represents a brightness factor, x and y represent chromaticity coordinates of a measurement object, xn and yn represent chromaticity coordinates of a perfect reflector (reflectivity=100%), a=800, and b=1700.

[0118] Meanwhile, for a completely white object, WI=100, and when treated with a fluorescent whitening agent or the like, WI may increase to 150, indicating that an object with a higher whiteness index value has a higher whiteness.

[0119] [Table 2]

[0120]

[0121] In Table 2, the elongation and whiteness index of Examples 1 to 5 were obtained by the above method and then indexed relative to the result of Comparative Example 1 (percentage).

[0122] [Table 3]

[0123]

[0124] In Table 3, the tensile strength and whiteness index of Examples 1 to 5 were obtained by the above method and then indexed relative to the result of Comparative Example 2 (percentage).

[0125] Table 2 shows that the MFI of the resin compositions of Examples 1 to 5 is 3.0 to 9.6, which is twice or more of the MFI of Comparative Example 1, and the elongation and whiteness index are also greatly improved.

[0126] Furthermore, Table 3 shows that the MFI of the resin compositions of Examples 1 to 5 increased by at least two times compared to Comparative Example 2, and the tensile strength was significantly improved while having the same level of whiteness index.

[0127] In this case, Comparative Example 1 is a graft copolymer and a molded article obtained therefrom; and Comparative Example 2 is the same resin composition as in Example 1 except that it contains polyethylene carbonate without end capping, and a molded article obtained therefrom.

[0128] Meanwhile, polyalkylene carbonate (PAC) has excellent flexibility and transparency, but poor heat resistance, strength and molding processability, and is therefore difficult to use alone. Therefore, it is usually blended with other resins such as graft copolymers (ABS) and used by extrusion molding. However, graft copolymers (ABS) have a high risk of yellowing, and are therefore difficult to add in large quantities in the composition. The poor compatibility of polyalkylene carbonate and ABS makes it difficult to obtain the physical properties of the desired level. These limitations can also be determined by Comparative Example 1 and Comparative Example 2. The MFI, elongation and whiteness index of Comparative Example 1 are poor, while the MFI and whiteness index of Comparative Example 2 are poor.

[0129] However, as determined in Tables 2 and 3, the resin compositions of Examples 1 to 5 according to one embodiment of the present invention have greatly improved MFI and also show overall excellent performance in terms of tensile strength, elongation, and whiteness index. The above results indicate that the resin composition according to the present invention contains a polyalkylene carbonate whose end is modified with a capping agent, and therefore has excellent compatibility with the graft copolymer (ABS), thereby having excellent molding processability, elongation, and surface properties.

Claims

1. A resin composition comprising: comprising an end-capped polyalkylene carbonate resin; and Graft copolymers, in, The end-capping unit is derived from any one or more units selected from maleic anhydride, 4-tert-octylphenol, 2-naphthol, 4-n-butoxyphenol, 4-phenylphenol, 4-(benzyloxy)phenol and 4-tert-butylphenol.

2. The resin composition according to claim 1, wherein The end capping unit is a maleic anhydride derived unit.

3. The resin composition according to claim 1, wherein The polyalkylene carbonate resin includes 0.5 to 2.0 wt % of the end capping portion.

4. The resin composition according to claim 1, wherein The polyalkylene carbonate resin and the graft copolymer are present in a weight ratio of 1:0.5 to 9.

5. The resin composition according to claim 1, wherein The graft copolymer comprises a conjugated diene rubber core and a shell comprising units derived from aromatic vinyl monomers and units derived from vinyl cyan monomers. The resin composition according to claim 5, wherein The graft copolymer comprises: 30 to 70 wt% of the conjugated diene-based rubber core; and 30 to 70 weight % of the shell comprising aromatic vinyl-based monomer-derived units and vinyl cyan-based monomer-derived units, and The shell includes 55 to 85 weight % of the aromatic vinyl-based monomer-derived units and 15 to 45 weight % of the vinyl cyan-based monomer-derived units.

7. The resin composition according to claim 1, wherein The polyalkylene carbonate resin further comprises antioxidant-derived units.

8. The resin composition according to claim 1, wherein The polyalkylene carbonate resin has a heat-resistant temperature of 230° C. to 300° C. and a melt index of 1 g / 10 min. to 25 g / 10 min. as measured at 190° C. with a load of 2.16 kg.

9. The resin composition according to claim 1, wherein The resin composition further includes a compatibilizer. 10 . A molded article comprising the resin composition according to claim 1 .

Images